Table 3. Estimated optimal pool size based on prevalence.

Prevalence range	Number of samples per pool	Number of samples per pooled plate	Average number of positive samples that will need retest per pool	Average number of positive samples that will need retest per plate
0.1-0.2%	20	1880	2-4	40-80
0.3-0.4%	15	1410	5-6	75-90
0.5-0.9%	10	940	5-9	50-90
1.0-1.4%	8	752	7-11	56-88
1.5-2.6%	6	564	9-15	54-90
2.7-3.8%	5	470	13-18	65-90
3.9-6.1%	4	376	15-23	60-92
6.2-10.9%	3	282	18-31	54-93
11-24.4%	2	188	21-46	42-92